Can I use a free website builder (like wix) for affiliate marketing or would the domain name put people off as it would be long. If yes would this be good for back links as well?

cheers

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This is a bad idea for affiliate marketers like us. Many times they will have their URL as part of yours. Example is those people that use wordpress.com to host their websites.

However, you are using wordpress, aren't you? - If so, their is no reason to use someone else's service. With a few special plug-ins when they are needed, you can make your website sing on your own. Marcus has good videos on this in the toolbar. Note marcus has over hundreds of video on youtube in which he covers a lot of this stuff. Subscribe to his youtube channel.

I dont think it is wised to build up your whole business on free things. Free things can crash any moment and all the efforts you are going to do are going to be wasted just in a blink. Would you like that or would you like to have a helping hand from web designer to design something good for your according to your niche.